CN110500879B

CN110500879B - Continuous silicon-carbon cathode dynamic CVD sintering furnace

Info

Publication number: CN110500879B
Application number: CN201910758826.7A
Authority: CN
Inventors: 王建业; 曾帅强; 龙纯; 谢礼飞; 宋晓峰; 何易鹏
Original assignee: CETC 48 Research Institute
Current assignee: CETC 48 Research Institute
Priority date: 2019-08-16
Filing date: 2019-08-16
Publication date: 2021-05-25
Anticipated expiration: 2039-08-16
Also published as: CN110500879A

Abstract

The invention discloses a continuous silicon-carbon cathode dynamic CVD sintering furnace, which comprises an installation platform, a spiral feeder, a furnace head cover, a furnace tube and a furnace tail cover, wherein the head end of the furnace tube is positioned in the furnace head cover, the tail end of the furnace tube is positioned in the furnace tail cover, the spiral feeder is in sealed butt joint with the furnace head cover, a discharge hole is formed in the furnace tail cover, a first sealing flange is arranged at the part of the head end of the furnace tube, which is positioned outside the furnace head cover, a first corrugated tube is arranged between the first sealing flange and the furnace head cover, the first sealing flange is in sealed connection with the first corrugated tube, a first air exhaust cover is sleeved at the periphery of the joint of the first sealing flange and the first corrugated tube, a second sealing flange is arranged at the part of the tail end of the furnace tube, which is positioned outside the furnace tail cover, a second corrugated tube is arranged between the second. The invention adopts the air extraction cover to extract the gas which is possibly leaked in time, thereby preventing the explosion danger caused by the leakage of the dangerous gas, and having good integral sealing performance, safety and reliability.

Description

Continuous silicon-carbon cathode dynamic CVD sintering furnace

Technical Field

The invention relates to battery cathode material sintering equipment, in particular to a continuous silicon-carbon cathode dynamic CVD sintering furnace.

Background

The cathode material is an important component of the lithium ion battery, and directly influences the indexes of the battery, such as energy density, cycle life, safety performance and the like. The silicon-carbon cathode (silicon-carbon cathode: a novel cathode material for lithium batteries, which is formed by compounding silicon and carbon and has various reaction technologies, namely CVD (chemical vapor deposition) is one of the new cathode materials, the capacity of the silicon-carbon cathode reaches tens of times of that of the mainstream graphite cathode material, and the silicon-carbon cathode is the future development direction of the cathode material. The CVD (Chemical Vapor deposition), a reaction technique, is a mainstream preparation method for carbon coating of silicon-carbon cathode, but no mature production equipment is available at present. In the CVD preparation method, materials need to rapidly enter a heating zone, the heating temperature is high, reaction gas is circularly introduced, the purity requirement of the atmosphere inside the equipment is high, and the integral sealing requirement is high.

In order to solve the problems, some companies adopt small intermittent rotary pipes for small-scale preparation, but the production is small, continuous feeding and discharging cannot be realized, the production can only be used for experimental purposes, and the batch production cannot be realized. The laboratory is adopted to produce the discontinuous rotary tubes in small batches, and the main defects are as follows: the discontinuous rotary pipe has small yield, is only limited to experimental research and cannot realize mass production; the production mode is discontinuous production, and continuous feeding and continuous production cannot be realized.

On the other hand, the existing continuous rotary furnace for mass production can not meet the production conditions of the silicon-carbon cathode, and is mainly embodied as follows:

(1) acetylene is required to be introduced as reaction gas in the carbon coating process of the silicon-carbon cathode, the reaction process is very easy to oxidize, the sealing effect requirement is very high, particularly the feeding and discharging sealing, the furnace tube dynamic sealing and the feeder shaft dynamic sealing are realized, and the sealing effect of the conventional rotary furnace cannot meet the sealing requirement of silicon-carbon cathode production;

(2) because of the existence of dangerous gases such as acetylene, methane, hydrogen and the like, the existing rotary furnace can not realize the explosion-proof function;

(3) the sintering quality of the silicon-carbon cathode is directly related to the carbon coating thickness, the ratio of a silicon source (silicon powder) and a carbon source (acetylene gas) needs to be accurately controlled in the carbon coating process, and the accurate ratio control of the feeding amount and the air inflow cannot be realized in the conventional rotary furnace.

Therefore, the development of the silicon-carbon cathode of the lithium battery needs to develop a CVD sintering furnace for the silicon-carbon cathode, which has the advantages of continuous feeding and discharging, batch production realization, good sealing effect and stable sintered product quality.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a continuous silicon-carbon cathode dynamic CVD sintering furnace which has good sealing performance and can prevent explosion danger caused by leakage of dangerous gases such as acetylene and the like in a room.

In order to solve the technical problems, the invention adopts the following technical scheme:

a continuous silicon-carbon cathode dynamic CVD sintering furnace comprises an installation platform, a spiral feeder, a furnace head cover, a furnace tube and a furnace tail cover, wherein the furnace tube is rotatably installed on the installation platform, the head end of the furnace tube is positioned in the furnace head cover, the tail end of the furnace tube is positioned in the furnace tail cover, the spiral feeder is in sealed butt joint with the furnace head cover, a spiral shaft of the spiral feeder penetrates through the furnace head cover to be in butt joint with the furnace tube, a discharge hole is formed in the furnace tail cover, a first sealing flange is arranged at the part of the head end of the furnace tube, which is positioned outside the furnace head cover, a first corrugated tube is arranged between the first sealing flange and the furnace head cover, the first sealing flange is in sealed connection with the first corrugated tube, a first exhaust cover is sleeved at the periphery of the joint of the first sealing flange and the first corrugated tube, a second sealing flange is arranged at the part of the tail end, the second sealing flange is connected with the second corrugated pipe in a sealing mode, and a second air exhaust cover is sleeved on the periphery of the joint of the second sealing flange and the second corrugated pipe.

As a further improvement of the above technical solution:

the first exhaust hood is provided with a main exhaust pipe and a plurality of spaced branch exhaust pipes in the circumferential direction, each branch exhaust pipe is communicated with the main exhaust pipe, the second exhaust hood is provided with a main exhaust pipe and a plurality of spaced branch exhaust pipes in the circumferential direction, and each branch exhaust pipe is communicated with the main exhaust pipe.

The upper reaches of spiral feeder are equipped with loading attachment, loading attachment includes feed bin and feeding surge bin, feeding surge bin is equipped with feed inlet, discharge gate, air inlet and gas outlet, the feed inlet and the butt joint of last feed bin of feeding surge bin, and the sealed butt joint of entry of discharge gate and spiral feeder.

The feeding device also comprises a weighing bin, the bottom of the weighing bin is provided with a weigher, and the weighing bin is connected with the feeding bin through a feeding pipe; the furnace tail cover is provided with a main air inlet, the main air inlet is connected with an air inlet pipe, the air inlet pipe is positioned in the furnace pipe, and the main air inlet is provided with a flowmeter.

A discharging buffer bin is arranged at the downstream of the furnace tail cover, the discharging buffer bin is provided with a feeding hole, a discharging hole, an air inlet and an air outlet, and the feeding hole is in butt joint with the discharging hole of the furnace tail cover; and a bin body air hammer for knocking each bin body is correspondingly arranged on the outer sides of the feeding buffer bin, the weighing bin and the discharging buffer bin.

The spiral feeder is internally provided with a broken arch shaft for preventing material blockage, the broken arch shaft is provided with blades, and the broken arch shaft is connected with a driving mechanism.

The two ends of the arch breaking shaft are mounted on the wall surface of the spiral feeder, each end and the wall surface are provided with a sealing structure, each sealing structure comprises a mounting plate, a sealing sleeve, a first sealing gasket, a second sealing gasket, a sealing bearing, a third sealing gasket, a pressing plate, a spring and a pressing cover, the mounting plate is fixed on the wall surface of the spiral feeder, the sealing sleeves are fixed on the mounting plate, the first sealing gasket is arranged between the sealing sleeves and the mounting plate, the second sealing gasket, the sealing bearing, the third sealing gasket, the pressing plate and the spring are sequentially located in the sealing sleeves, the second sealing gasket abuts against the first sealing gasket, the pressing cover covers the sealing sleeves and is in threaded connection with the sealing sleeves, one surface of the third sealing gasket, which faces away from the sealing bearing, is provided with a frustum part, and the pressing; the inner wall of the seal sleeve is provided with a radial boss, and the second seal gasket is provided with a step groove matched with the radial boss.

The mounting platform is provided with a first sliding groove seat with adjustable height and a second sliding groove seat with adjustable height, the spiral feeder and the furnace end cover are arranged in a sliding groove of the first sliding groove seat in a sliding manner, and the furnace end cover is arranged in a sliding groove in the second sliding groove seat in a sliding manner; the furnace head cover and the furnace tail cover are both provided with explosion-proof doors.

The head end of the furnace tube is provided with a conical inner container, the inlet of the furnace tube is the inlet of the conical inner container, heat insulation cotton is arranged between the furnace tube and the outer wall of the conical inner container, and the mounting platform is provided with a furnace tube air hammer capable of knocking the furnace tube; the middle part of the furnace tube is sleeved with a heat insulation sleeve, and a heating device is arranged in a gap between the lower end of the furnace tube and the heat insulation sleeve.

The mounting platform comprises a bedplate and two supports for supporting the bedplate, and the support close to the head end of the furnace tube is an adjustable support; and a support bearing is arranged on the bedplate, and the furnace tube is supported on the support bearing.

Compared with the prior art, the invention has the advantages that:

(1) the continuous silicon-carbon cathode dynamic CVD sintering furnace utilizes the dynamic sintering characteristic of the rotary furnace, applies the rotary furnace to the sintering carbon coating process of the silicon-carbon cathode material of the lithium battery, is sleeved with the first air exhaust cover at the periphery of the joint of the first sealing flange at the head end of the furnace tube and the first corrugated tube, is sleeved with the second air exhaust cover at the periphery of the joint of the second sealing flange at the tail end of the furnace tube and the second corrugated tube, and adopts the air exhaust cover to timely exhaust gas which possibly leaks, so that the explosion danger caused by the leakage of dangerous gas such as acetylene and the like in a room is prevented, the sealing of the two ends of the furnace tube is realized, the integral sealing performance is good, the safety and the reliability are realized, and the continuous batch production of the silicon-.

(2) According to the continuous silicon-carbon cathode dynamic CVD sintering furnace, the feeding amount of silicon powder and the acetylene air inflow are accurately controlled by the weighing bin and the flow meter, the dynamic seal of the spiral feeder and the furnace tube is realized by adopting four-layer seal and graphite ring seal, the sealing of the feeding and discharging ports is realized by adopting the feeding buffer bin and the discharging buffer bin, the interior of the furnace tube is isolated from the external environment, the explosion accident generated in the equipment is prevented by adopting an explosion door, and the continuous batch production of silicon-carbon cathodes is further realized.

Drawings

Fig. 1 is a schematic structural view of the present invention.

FIG. 2 is a schematic view of a first extraction hood according to the present invention.

Fig. 3 is an axial schematic view of the first extraction hood according to the invention.

FIG. 4 is a schematic view showing the structure of the screw feeder of the present invention.

Fig. 5 is a schematic view of the sealing structure at both ends of the arch breaking shaft in the present invention.

The reference numerals in the figures denote:

1. mounting a platform; 2. a screw feeder; 3. a furnace head cover; 4. a furnace tube; 5. a furnace tail cover; 6. a screw shaft; 7. a first sealing flange; 8. a first bellows; 9. a first extraction hood; 10. a second sealing flange; 11. a second bellows; 12. a second extraction hood; 13. a main exhaust pipe; 14. a branch exhaust pipe; 15. feeding a bin; 16. a feeding buffer bin; 17. a weighing bin; 18. a weighing device; 19. feeding pipes; 20. a primary air inlet; 21. an air inlet pipe; 22. a flow meter; 23. a discharging buffer bin; 24. a bin body air hammer; 25. breaking an arch shaft; 26. a blade; 27. a drive mechanism; 28. mounting a plate; 29. sealing sleeves; 30. a first gasket; 31. a second gasket; 32. sealing the bearing; 33. a third gasket; 34. pressing a plate; 35. a spring; 36. a gland; 37. a frustum portion; 38. a taper hole; 39. a radial boss; 40. a step groove; 41. a first chute seat; 42. a second chute seat; 43. an explosion vent; 44. a conical inner container; 45. heat insulation cotton; 46. furnace tube air hammer; 47. a thermal insulation sleeve; 48. a heating device; 49. a platen; 50. a support; 51. a support bearing; 52. a star-shaped discharge valve; 53. a surge bin support; 54. a motor; 55. a gear connection structure; 56. a temporary waste storage bin; 57. a feeding frame; 58. a hose.

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples of the specification.

As shown in fig. 1 to 5, the continuous silicon-carbon cathode dynamic CVD sintering furnace of the present embodiment includes a mounting platform 1, a spiral feeder 2, a furnace head cover 3, a furnace tube 4 and a furnace tail cover 5, wherein the furnace tube 4 is rotatably mounted on the mounting platform 1, a head end of the furnace tube 4 is located in the furnace head cover 3, a tail end of the furnace tube 4 is located in the furnace tail cover 5, the spiral feeder 2 is in sealed butt joint with the furnace head cover 3 through a soft channel, a spiral shaft 6 of the spiral feeder 2 passes through the soft channel and the furnace head cover 3 to be in butt joint with the furnace tube 4, a discharge port is provided on the furnace tail cover 5, a first sealing flange 7 is provided at a portion of the head end of the furnace tube 4 outside the furnace head cover 3, a first corrugated tube 8 is provided between the first sealing flange 7 and the furnace head cover 3, the first sealing flange 7 is in sealed connection with the first corrugated tube 8, a second sealing flange 10 is provided at a portion of the tail end of the, the second sealing flange 10 is connected with the second corrugated pipe 11 in a sealing way.

The spiral feeder 2 sends the material on the upstream to the furnace tube 4, the seal between the furnace tube 4 and the furnace end cover 3 is sealed by the first sealing flange 7 and the first corrugated tube 8, because the furnace tube 4 needs to rotate, a graphite ring is arranged between the first sealing flange 7 and the first corrugated tube 8, the dynamic seal is further realized, similarly, the seal between the furnace tube 4 and the furnace end cover 5 is realized by the second sealing flange 10 and the second corrugated tube 11, and the graphite ring is also arranged between the furnace tube 4 and the furnace end cover to realize the dynamic seal. Although the two ends of the furnace tube are sealed well, the furnace tube still has the possibility of air leakage due to the continuous rotation of the furnace tube during the operation, and particularly dangerous gases such as acetylene, methane or hydrogen exist in the furnace tube 4, for this reason, in this embodiment, a first air extraction cover 9 is sleeved on the periphery of the joint of the first sealing flange 7 at the head end of the furnace tube 4 and the first corrugated tube 8, and a second air extraction cover 12 is sleeved on the periphery of the joint of the second sealing flange 10 at the tail end of the furnace tube 4 and the second corrugated tube 11, so that once the joint is leaked by gas, the gas is extracted through the air extraction cover, thereby preventing the explosion.

The invention utilizes the characteristic of dynamic sintering of the rotary furnace to apply the rotary furnace to the sintering carbon coating process of the lithium battery silicon carbon cathode material. The gas that will probably reveal is in time taken away to the gas that adopts the cover of bleeding to prevent dangerous gas such as indoor acetylene from leaking and causing the dangerous production of explosion, realize the sealed at furnace tube 4 both ends, whole leakproofness is good, safe and reliable, thereby realizes silicon carbon negative pole continuity batch production.

In this embodiment, a main exhaust pipe 13 and a plurality of spaced branch exhaust pipes 14 are disposed in the circumferential direction of the first exhaust hood 9, each branch exhaust pipe 14 is communicated with the main exhaust pipe 13, the branch exhaust pipes 14 are merged with the main exhaust pipe 13, and a fan (not shown) is installed outside the main exhaust pipe 13 for air exhaust. The main exhaust pipe 13 is combined with the branch exhaust pipes 14 to quickly exhaust the gas in the first exhaust hood 9, so that the acetylene gas is prevented from leaking outwards to generate indoor leakage explosion accidents. Similarly, a main exhaust pipe 13 and a plurality of spaced branch exhaust pipes 14 are arranged in the circumferential direction of the second exhaust hood 12, and each branch exhaust pipe 14 is communicated with the main exhaust pipe 13.

In this embodiment, a feeding device is disposed upstream of the screw feeder 2, the feeding device includes a feeding bin 15 and a feeding buffer bin 16, as shown in fig. 1, the feeding buffer bin 16 has a feeding port 16a, a discharging port 16b, an air inlet 16c and an air outlet 16d, and the feeding port 16a and the discharging port 16b are both provided with star-shaped discharge valves 52. The inlet 16a of the feeding surge bin 16 is butted with the upper bin 15, and the outlet 16b is hermetically butted with the inlet of the screw feeder 2.

During operation, the star-shaped discharge valve 52 of the feed inlet 16a of the feeding bin 15 is opened for feeding, the star-shaped discharge valve 52 of the feed inlet is closed after the feeding buffer bin 16 is full of materials, protective gas is input through the air inlet 16c, air is discharged through the air outlet 16d, after the atmosphere inside the feeding buffer bin 16 reaches the standard, the star-shaped discharge valve 52 of the discharge outlet 16b is opened for discharging the materials into the spiral feeder 2, the star-shaped discharge valve 52 of the discharge outlet 16b is closed after discharging is completed, next-time circulating feeding is performed, the materials inside the input furnace tube 4 meet the atmosphere requirement, the materials are prevented from being brought into the air to enter the furnace tube 4, and the feed end of the furnace tube 4 is isolated. A bin body air hammer 24 is arranged outside the feeding buffer bin 16, and the bin body of the feeding buffer bin 16 is rapped at regular time during blanking, so that the material is prevented from arching and blocking. The feed surge bin 16 is secured to the ground by a surge bin support 53.

In order to accurately control the feeding amount of the silicon powder, a weighing bin 17 is required to be arranged for weighing before the material enters the feeding bin 15, a weighing device 18 is arranged at the bottom of the weighing bin 17, the weighing bin 17 is connected with the feeding bin 15 through a feeding pipe 19, before feeding, the weighing device 18 records the value G1 of the weighing bin 17, after feeding, the weighing device 18 records the value G2 of the weighing bin 17, and then the weight of the material at this time is G1-G2. The top of the furnace tail cover 5 is provided with a main air inlet 20, the main air inlet 20 is connected with an air inlet pipe 21, the air inlet pipe 21 is positioned in the furnace tube 4, the main air inlet 20 is introduced with acetylene reaction gas, and the reaction gas is directly introduced into a heating zone in the furnace tube 4 through the air inlet pipe 21 so as to fully ensure the gas flow during reaction. The main air inlet 20 is provided with a flow meter 22 for accurately measuring the acetylene air inflow in real time. The feeding amount of the silicon powder and the air inflow of acetylene are accurately controlled by adopting a weighing bin 17 and a flowmeter 22.

In this embodiment, a discharge buffer bin 23 is disposed downstream of the furnace tail cover 5, as shown in fig. 1, the discharge buffer bin 23 is provided with a feed inlet 23a, a discharge outlet 23b, an air inlet 23c, and an air outlet 23d, and the feed inlet 23a is in butt joint with the discharge outlet of the furnace tail cover 5. Feed inlet 23a, discharge gate 23b all sets up star type discharge valve 52, during the ejection of compact, open feed inlet 23 a's star type discharge valve 52, close discharge gate 23b star type discharge valve 52, unload the material in furnace tube 4 into ejection of compact surge bin 23, close feed inlet 23 a's star type discharge valve 52 after the material is full, input shielding gas through air inlet 23c and through gas outlet 23d exhaust air, open discharge gate 23 b's star type discharge valve 52 and unload after ejection of compact surge bin 23 inside atmosphere is up to standard, close discharge gate 23 b's star type discharge valve 52 after unloading finishes, the next time circulation ejection of compact carries out again, realize that furnace tube 4's discharge end and outside air are kept apart. The external part of the discharging buffer bin 23 is provided with a bin body air hammer 24, and the bin body of the discharging buffer bin 23 is vibrated at regular time during discharging to prevent the material from arching and blocking.

In this embodiment, the screw feeder 2 is provided with a material blocking preventing arch breaking shaft 25, the arch breaking shaft 25 is provided with blades 26, and the arch breaking shaft 25 is connected with a driving mechanism 27. The two ends of the arch breaking shaft 25 are installed on the wall surface of the screw feeder 2, each end and the wall surface are provided with a sealing structure, each sealing structure comprises an installation plate 28, a sealing sleeve 29, a first sealing gasket 30, a second sealing gasket 31, a sealing bearing 32, a third sealing gasket 33, a pressing plate 34, a spring 35 and a pressing cover 36, and the sealing structure is integrally sleeved on the arch breaking shaft 25. The mounting plate 28 is fixed on the wall surface of the screw feeder 2, the sealing sleeve 29 is fixed on the mounting plate 28, the first sealing gasket 30 is arranged between the sealing sleeve 29 and the mounting plate 28 to form a first layer of sealing, and the first layer of sealing mainly realizes end face sealing, namely end face sealing of the sealing sleeve 29 and the mounting plate 28. The second sealing gasket 31, the sealing bearing 32, the third sealing gasket 33, the pressing plate 34 and the spring 35 are sequentially located in the sealing sleeve 29, the second sealing gasket 31 is abutted to the first sealing gasket 30, the pressing cover 36 covers the sealing sleeve 29 and is in threaded connection with the sealing sleeve 29, a conical table portion 37 is arranged on one surface, back to the sealing bearing 32, of the third sealing gasket 33, and the pressing plate 34 is provided with a conical hole 38 capable of being matched with the conical table portion 37. A second layer of seal is formed between the second seal gasket 31 and the arch-breaking shaft 25, and the main function is to enable the seal sleeve 29 and the arch-breaking shaft 25 to form a dynamic seal, and the layer of seal can also prevent dust from overflowing. The sealing bearing 32 enables the sealing sleeve 29 to form a dynamic seal (or a third layer of seal) with the broken arch shaft 25, and realizes the rotation and the support of the broken arch shaft 25. The gland 36 is rotated, the spring 35 extrudes the pressing plate 34, the taper hole 38 of the pressing plate 34 and the frustum part 37 extrude to form continuous inclined plane extrusion, and the extrusion axial force is converted into radial force to form radial seal, namely a fourth layer of seal, the layer of seal also has the function of enabling the seal sleeve 29 and the broken arch shaft 25 to form dynamic seal, and the layer of seal can also achieve the sealing effect of preventing gas from entering and exiting. When the seal of the fourth layer is used for a longer time, the inclined convex conical part 37 and the inclined concave conical hole 38 are abraded, so that the spring 35 is loosened to weaken the sealing effect, and the pressing force can be provided by further screwing the pressing cover 36 to enable the spring 35 to be pressed again, so that the sealing effect is enhanced.

In order to improve the sealing effect of the second layer, the inner wall of the sealing sleeve 29 is provided with a radial boss 39, and the second sealing gasket 31 is provided with a step groove 40 which can be matched with the radial boss 39.

In this embodiment, the driving mechanism 27 can synchronously drive the arch breaking shaft 25 and the screw shaft 6, the driving mechanism 27 includes a motor 54, the motor 54 is connected with the screw shaft 6 through a gear chain structure 55, and the screw shaft 6 is connected with the arch breaking shaft 25 through the gear chain structure 55. The rotation amplitude of the breaking arch shaft 25 and the screw shaft 6 can be adjusted by adjusting the number of teeth of each gear in the gear chain structure 55.

In this embodiment, the mounting platform 1 is provided with a first chute seat 41 with adjustable height and a second chute seat 42 with adjustable height, and the furnace head cover 3 is rolled in the chute of the first chute seat 41 through wheels, the furnace tail cover 5 is rolled in the chute of the second chute seat 42, the screw feeder 2 is mounted on the feeding frame 57, the feeding frame 57 is rolled in the chute of the first chute seat 41 through wheels, and the front and back positions of the screw feeder 2, the furnace head cover 3 and the furnace tail cover 5 are adjustable. The mounting platform 1 comprises a bedplate 49 and two supports 50 for supporting the bedplate 49, the support 50 close to the head end of the furnace tube 4 is an adjustable support, specifically, the adjustable support is of a screw nut structure, the head end of the furnace tube 4 can be higher than the tail end, and the proper inclination angle can ensure that materials in the furnace tube 4 are completely discharged. The bedplate 49 is provided with a support bearing 51, the furnace tube 4 is supported on the support bearing 51, the furnace tube 4 can rotate around the support bearing 51, the tail end part of the furnace tube 4 is provided with a driving gear, and the driving gear is connected with a driving motor so as to drive the furnace tube 4 to rotate. The first sliding groove seat 41 is fixed on the bedplate 49 through a waist hole structure, the height of the first sliding groove seat 41 is adjustable through the waist hole structure, and similarly, the second sliding groove seat 42 is fixed on the bedplate 49 through the waist hole structure, so that the height of the spiral feeder 2, the furnace end cover 3 and the furnace tail cover 5 is adjustable. The screw feeder 2 is connected with the feeding buffer bin 16 through a hose 58, so that the relative motion between the screw feeder 2 and the feeding buffer bin 16 can be realized when the inclination angle of the furnace tube 6 is adjusted.

In this embodiment, the top of the furnace head cover 3 is provided with a main exhaust port 3a for exhausting air and reacting tail gas, and the lower end face is provided with a branch air inlet 3b for ensuring the protective atmosphere environment at the bottom of the furnace head cover 3 and preventing the generation of the protective atmosphere dead angle. The explosion door 43 is arranged on the front end face to prevent equipment failure from explosion, and the bottom of the explosion door is connected with the waste temporary storage bin 56 through the star-shaped discharge valve 52, so that materials generated by material raising at the feed end of the furnace tube 4 are temporarily stored and the discharge opening is isolated and sealed from the outside air.

The rear end face of the furnace tail cover 5 is provided with a branch air inlet 5b to ensure the furnace tail cover (5 internal protective atmosphere environment for preventing the generation of protective atmosphere dead angle, the front end face is provided with an explosion-proof door 43 for preventing the explosion caused by equipment failure, and the bottom is connected with the discharging buffer bin 23 through a star-shaped discharging valve 52.

In this embodiment, a tapered inner container 44 is disposed at the head end of the furnace tube 4, the inlet of the furnace tube 4 is the inlet of the tapered inner container 44, and the tapered inner container 44 functions as: firstly, no flowing dead angle is generated when the reaction gas flows from the discharging end to the feeding end, and secondly, the material is prevented from flowing back after entering the furnace tube 4. Heat insulation cotton 45 is arranged in a cavity between the furnace tube 4 and the outer wall of the conical inner container 44, so that a heating area in the furnace tube 4 and a structural member at the feeding end generate a heat insulation effect. The middle part of the furnace tube 4 is sleeved with a heat insulation sleeve 47 which surrounds the furnace tube to realize the heat insulation effect, and a heating device 48 is arranged in the gap between the lower end of the furnace tube 4 and the heat insulation sleeve 47 and heats the heating zone of the furnace tube. The mounting platform 1 is provided with two furnace tube air hammers 46 capable of knocking the furnace tubes 4, the two furnace tube air hammers 46 are respectively arranged at positions below two ends of the furnace tubes 4 extending out of the heat insulation sleeve 47, the furnace tube air hammers 46 can regularly knock the furnace tubes 4, the knocking force is adjustable, and the function of preventing materials from being stuck on the wall is realized.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.

Claims

1. A continuous silicon-carbon cathode dynamic CVD sintering furnace is characterized in that: comprises a mounting platform (1), a spiral feeder (2), a furnace end cover (3), a furnace tube (4) and a furnace tail cover (5), wherein the furnace tube (4) is rotatably mounted on the mounting platform (1), the head end of the furnace tube (4) is positioned in the furnace end cover (3) and the tail end of the furnace tail cover (5), the spiral feeder (2) is in sealed butt joint with the furnace end cover (3), a spiral shaft (6) of the spiral feeder (2) penetrates through the furnace end cover (3) to be in butt joint with the furnace tube (4), a discharge hole is formed in the furnace tail cover (5), a first sealing flange (7) is arranged at the part of the head end of the furnace tube (4) outside the furnace end cover (3), a first corrugated pipe (8) is arranged between the first sealing flange (7) and the furnace end cover (3), the first corrugated pipe (7) is in sealed connection with the first corrugated pipe (8), and a first exhaust cover (9) is sleeved at the periphery of the connection part of the first, a second sealing flange (10) is arranged at the tail end of the furnace tube (4) outside the furnace tail cover (5), a second corrugated tube (11) is arranged between the second sealing flange (10) and the furnace tail cover (5), the second sealing flange (10) is in sealing connection with the second corrugated tube (11), a second air exhaust cover (12) is sleeved on the periphery of the joint of the second sealing flange (10) and the furnace tail cover, a conical inner container (44) is arranged at the head end of the furnace tube (4), an inlet of the furnace tube (4) is an inlet of the conical inner container (44), heat insulation cotton (45) is arranged between the furnace tube (4) and the outer wall of the conical inner container (44), and a gas furnace tube hammer (46) capable of knocking the furnace tube (4) is arranged on the mounting platform (1); the middle part of the furnace tube (4) is sleeved with a heat insulation sleeve (47), and a heating device (48) is arranged in a gap between the lower end of the furnace tube (4) and the heat insulation sleeve (47).

2. The continuous silicon-carbon negative electrode dynamic CVD sintering furnace according to claim 1, characterized in that: the air pump is characterized in that a main air pumping pipe (13) and a plurality of spaced branch air pumping pipes (14) are arranged in the circumferential direction of the first air pumping cover (9), each branch air pumping pipe (14) is communicated with the main air pumping pipe (13), a main air pumping pipe (13) and a plurality of spaced branch air pumping pipes (14) are arranged in the circumferential direction of the second air pumping cover (12), and each branch air pumping pipe (14) is communicated with the main air pumping pipe (13).

3. The continuous silicon-carbon negative electrode dynamic CVD sintering furnace according to claim 1, characterized in that: the upper reaches of screw feeder (2) are equipped with loading attachment, loading attachment includes feed bin (15) and feeding surge bin (16), feeding surge bin (16) are equipped with feed inlet, discharge gate, air inlet and gas outlet, the feed inlet and the butt joint of feed bin (15) are gone up to the feed inlet of feeding surge bin (16), and the sealed butt joint of entry of discharge gate and screw feeder (2).

4. The continuous silicon-carbon negative electrode dynamic CVD sintering furnace according to claim 3, characterized in that: the feeding device further comprises a weighing bin (17), a weigher (18) is arranged at the bottom of the weighing bin (17), and the weighing bin (17) is connected with the feeding bin (15) through a feeding pipe (19); the furnace tail cover (5) is provided with a main air inlet (20), the main air inlet (20) is connected with an air inlet pipe (21), the air inlet pipe (21) is positioned in the furnace pipe (4), and the main air inlet (20) is provided with a flowmeter (22).

5. The continuous silicon-carbon negative electrode dynamic CVD sintering furnace according to claim 4, characterized in that: a discharge buffer bin (23) is arranged at the downstream of the furnace tail cover (5), the discharge buffer bin (23) is provided with a feed inlet, a discharge outlet, an air inlet and an air outlet, and the feed inlet is butted with the discharge outlet of the furnace tail cover (5); and a bin body air hammer (24) for knocking each bin body is correspondingly arranged on the outer sides of the feeding buffer bin (16), the weighing bin (17) and the discharging buffer bin (23).

6. The continuous silicon-carbon anode dynamic CVD sintering furnace according to any one of claims 1 to 5, wherein: an arch breaking shaft (25) for preventing material blockage is arranged in the screw feeder (2), the arch breaking shaft (25) is provided with blades (26), and the arch breaking shaft (25) is connected with a driving mechanism (27).

7. The continuous silicon-carbon negative electrode dynamic CVD sintering furnace according to claim 6, characterized in that: the two ends of the arch breaking shaft (25) are installed on the wall surface of the spiral feeder (2), each end and the wall surface are provided with a sealing structure, each sealing structure comprises a mounting plate (28), a sealing sleeve (29), a first sealing gasket (30), a second sealing gasket (31), a sealing bearing (32), a third sealing gasket (33), a pressing plate (34), a spring (35) and a pressing cover (36), the mounting plate (28) is fixed on the wall surface of the spiral feeder (2), the sealing sleeve (29) is fixed on the mounting plate (28), the first sealing gasket (30) is arranged between the sealing sleeve (29) and the mounting plate (28), the second sealing gasket (31), the sealing bearing (32), the third sealing gasket (33), the pressing plate (34) and the spring (35) are sequentially located in the sealing sleeve (29), and the second sealing gasket (31) is abutted to the first sealing gasket (30), the gland (36) covers the sealing sleeve (29) and is in threaded connection with the sealing sleeve (29), a conical table part (37) is arranged on one surface, back to the sealing bearing (32), of the third sealing gasket (33), and a conical hole (38) capable of being matched with the conical table part (37) is formed in the pressure plate (34); the inner wall of the sealing sleeve (29) is provided with a radial boss (39), and the second sealing gasket (31) is provided with a step groove (40) matched with the radial boss (39).

8. The continuous silicon-carbon anode dynamic CVD sintering furnace according to any one of claims 1 to 5, wherein: the mounting platform (1) is provided with a first sliding groove seat (41) with adjustable height and a second sliding groove seat (42) with adjustable height, the spiral feeder (2) and the furnace end cover (3) are arranged in a sliding groove of the first sliding groove seat (41) in a sliding mode, and the furnace end cover (5) is arranged in a sliding groove in the second sliding groove seat (42) in a sliding mode; the furnace head cover (3) and the furnace tail cover (5) are both provided with explosion-proof doors (43).

9. The continuous silicon-carbon anode dynamic CVD sintering furnace according to any one of claims 1 to 5, wherein: the mounting platform (1) comprises a bedplate (49) and two supports (50) for supporting the bedplate (49), wherein the support (50) close to the head end of the furnace tube (4) is an adjustable support; the bedplate (49) is provided with a supporting bearing (51), and the furnace tube (4) is supported on the supporting bearing (51).